I had this issue too but by me it said 197/200 missing 3 stars while i actually completed the whole thing with 3 stars in every single level. I tried playing the game all over again from scratch but that didn't help it was simply glitched. I sent a message to Brynjolf and, while it took them a very long time to fix it, I was one day logged out of my account and when I came back in the 200 gems I deserved were added to my account :) So just send him a message with proof of pictures showing that you really completed all levels with 3 stars each and he will fix it for you. Good luck ~